With the continuous cloudification of enterprise IT architectures and widespread use of public clouds, increasingly more enterprises are starting to shift their infrastructures (such as enterprise data centers) to the cloud, abandon traditional closed IT architectures, and instead use open network architectures. To further this, enterprises’ mission-critical applications are migrated onto the cloud, such as the office, production ERP system, and sales system. Under this situation, enterprises increasingly rely on the Software as a Service (SaaS) provided by application service providers, and prefer to access key applications required for daily office work from the cloud through the Internet.

The overall architecture SD-WAN Solution comprises the network connection layer, control layer, and management layer.

Network connection layer
Enterprises deploy cost-effective routers and use overlay technology to build full network interconnections between the headquarters, branches, and public or private clouds on demand through links such as Internet links and traditional private lines.

Control layer
Routers (RRs) c policy provisioning, route transfer between sites in each area, and inter-area network interconnection.

Management layer
Central Maanagement System implements full-process management on enterprise interconnection services. In the southbound direction, configuration and orchestration of different virtual private network (VPN) topologies, as well as management and provisioning of network service policies.

The enterprise headquarters and branches can use dual CPEs as gateways and access the network through both MPLS and Internet links, meeting the high quality requirements for private lines. Sites where wired links are unavailable can also use LTE links to access the network. CPEs at the headquarters or large branch sites can function as RRs. Independent devices can also be deployed as RRs.

Hierarchical QoS policies and bandwidth- or application-based intelligent traffic steering are configured to ensure experience of mission-critical services, implement load balancing, and improve bandwidth utilization.

This solution provides ZTP, automatic service orchestration and delivery, multi-dimensional visualized management for links and services, and various fault diagnosis and inspection tools to simplify network deployment and O&M of a large number of branches.